diff --git a/packages/nc-gui/components/project/spreadsheet/components/editColumn/formulaOptions.vue b/packages/nc-gui/components/project/spreadsheet/components/editColumn/formulaOptions.vue
index 5a7f1afe59..3eb5015e9e 100644
--- a/packages/nc-gui/components/project/spreadsheet/components/editColumn/formulaOptions.vue
+++ b/packages/nc-gui/components/project/spreadsheet/components/editColumn/formulaOptions.vue
@@ -1,24 +1,36 @@
 <template>
-  <v-text-field
-    v-model="formula.value"
-    dense
-    outlined
-    class="caption"
-    hide-details="auto"
-    label="Formula"
-    persistent-hint
-    hint="Available formulas are ADD, AVG, CONCAT, +, -, /"
-  />
+  <div>
+    <!-- todo: autocomplete based on available functions and metadata -->
+    <v-text-field
+      v-model="formula.value"
+      dense
+      outlined
+      class="caption"
+      hide-details="auto"
+      label="Formula"
+      persistent-hint
+      hint="Available formulas are ADD, AVG, CONCAT, +, -, /"
+      :rules="[v => !!v || 'Required', v => parseAndValidateFormula(v)]"
+    />
+  </div>
 </template>
 
 <script>
+
+import jsep from 'jsep'
+
 export default {
   name: 'FormulaOptions',
-  props: ['nodes', 'column', 'meta', 'isSQLite', 'alias'],
+  props: ['nodes', 'column', 'meta', 'isSQLite', 'alias', 'value'],
   data: () => ({
     formula: {},
-    formulas: ['AVERAGE()', 'COUNT()', 'COUNTA()', 'COUNTALL()', 'SUM()', 'MIN()', 'MAX()', 'AND()', 'OR()', 'TRUE()', 'FALSE()', 'NOT()', 'XOR()', 'ISERROR()', 'IF()', 'LEN()', 'MID()', 'LEFT()', 'RIGHT()', 'FIND()', 'CONCATENATE()', 'T()', 'VALUE()', 'ARRAYJOIN()', 'ARRAYUNIQUE()', 'ARRAYCOMPACT()', 'ARRAYFLATTEN()', 'ROUND()', 'ROUNDUP()', 'ROUNDDOWN()', 'INT()', 'EVEN()', 'ODD()', 'MOD()', 'LOG()', 'EXP()', 'POWER()', 'SQRT()', 'CEILING()', 'FLOOR()', 'ABS()', 'RECORD_ID()', 'CREATED_TIME()', 'ERROR()', 'BLANK()', 'YEAR()', 'MONTH()', 'DAY()', 'HOUR()', 'MINUTE()', 'SECOND()', 'TODAY()', 'NOW()', 'WORKDAY()', 'DATETIME_PARSE()', 'DATETIME_FORMAT()', 'SET_LOCALE()', 'SET_TIMEZONE()', 'DATESTR()', 'TIMESTR()', 'TONOW()', 'FROMNOW()', 'DATEADD()', 'WEEKDAY()', 'WEEKNUM()', 'DATETIME_DIFF()', 'WORKDAY_DIFF()', 'IS_BEFORE()', 'IS_SAME()', 'IS_AFTER()', 'REPLACE()', 'REPT()', 'LOWER()', 'UPPER()', 'TRIM()', 'SUBSTITUTE()', 'SEARCH()', 'SWITCH()', 'LAST_MODIFIED_TIME()', 'ENCODE_URL_COMPONENT()', 'REGEX_EXTRACT()', 'REGEX_MATCH()', 'REGEX_REPLACE()']
+    // formulas: ['AVERAGE()', 'COUNT()', 'COUNTA()', 'COUNTALL()', 'SUM()', 'MIN()', 'MAX()', 'AND()', 'OR()', 'TRUE()', 'FALSE()', 'NOT()', 'XOR()', 'ISERROR()', 'IF()', 'LEN()', 'MID()', 'LEFT()', 'RIGHT()', 'FIND()', 'CONCATENATE()', 'T()', 'VALUE()', 'ARRAYJOIN()', 'ARRAYUNIQUE()', 'ARRAYCOMPACT()', 'ARRAYFLATTEN()', 'ROUND()', 'ROUNDUP()', 'ROUNDDOWN()', 'INT()', 'EVEN()', 'ODD()', 'MOD()', 'LOG()', 'EXP()', 'POWER()', 'SQRT()', 'CEILING()', 'FLOOR()', 'ABS()', 'RECORD_ID()', 'CREATED_TIME()', 'ERROR()', 'BLANK()', 'YEAR()', 'MONTH()', 'DAY()', 'HOUR()', 'MINUTE()', 'SECOND()', 'TODAY()', 'NOW()', 'WORKDAY()', 'DATETIME_PARSE()', 'DATETIME_FORMAT()', 'SET_LOCALE()', 'SET_TIMEZONE()', 'DATESTR()', 'TIMESTR()', 'TONOW()', 'FROMNOW()', 'DATEADD()', 'WEEKDAY()', 'WEEKNUM()', 'DATETIME_DIFF()', 'WORKDAY_DIFF()', 'IS_BEFORE()', 'IS_SAME()', 'IS_AFTER()', 'REPLACE()', 'REPT()', 'LOWER()', 'UPPER()', 'TRIM()', 'SUBSTITUTE()', 'SEARCH()', 'SWITCH()', 'LAST_MODIFIED_TIME()', 'ENCODE_URL_COMPONENT()', 'REGEX_EXTRACT()', 'REGEX_MATCH()', 'REGEX_REPLACE()']
+    availableFunctions: ['AVG', 'ADD', 'CONCAT'],
+    availableBinOps: ['+', '-', '*', '/']
   }),
+  created() {
+    this.formula = this.value ? { ...this.value } : {}
+  },
   methods: {
     async save() {
       try {
@@ -32,7 +44,10 @@ export default {
 
         meta.v.push({
           _cn: this.alias,
-          formula: this.formula
+          formula: {
+            ...this.formula,
+            tree: jsep(this.formula.value)
+          }
         })
 
         await this.$store.dispatch('sqlMgr/ActSqlOp', [{
@@ -43,10 +58,69 @@ export default {
           meta
         }])
 
+        this.$toast.success('Formula column saved successfully').goAway(3000)
         return this.$emit('saved', this.alias)
       } catch (e) {
         this.$toast.error(e.message).goAway(3000)
       }
+    },
+    async update() {
+      try {
+        const meta = JSON.parse(JSON.stringify(this.$store.state.meta.metas[this.meta.tn]))
+
+        const col = meta.v.find(c => c._cn === this.column._cn && c.formula)
+
+        Object.assign(col, {
+          _cn: this.alias,
+          formula: {
+            ...this.formula,
+            tree: jsep(this.formula.value),
+            error: undefined
+          }
+        })
+
+        await this.$store.dispatch('sqlMgr/ActSqlOp', [{
+          env: this.nodes.env,
+          dbAlias: this.nodes.dbAlias
+        }, 'xcModelSet', {
+          tn: this.nodes.tn,
+          meta
+        }])
+        this.$toast.success('Formula column updated successfully').goAway(3000)
+      } catch (e) {
+        this.$toast.error(e.message).goAway(3000)
+      }
+    },
+    // todo: validate formula based on meta
+    parseAndValidateFormula(formula) {
+      try {
+        const pt = jsep(formula)
+        const err = this.validateAgainstMeta(pt)
+        if (err.length) {
+          return err.join(', ')
+        }
+      } catch (e) {
+        return e.message
+      }
+    },
+    validateAgainstMeta(pt, arr = []) {
+      if (pt.type === 'CallExpression') {
+        if (!this.availableFunctions.includes(pt.callee.name)) {
+          arr.push(`'${pt.callee.name}' function is not available`)
+        }
+        pt.arguments.map(arg => this.validateAgainstMeta(arg, arr))
+      } else if (pt.type === 'Identifier') {
+        if (this.meta.columns.every(c => c.cn !== pt.name)) {
+          arr.push(`Column with name '${pt.name}' is not available`)
+        }
+      } else if (pt.type === 'BinaryExpression') {
+        if (!this.availableBinOps.includes(pt.operator)) {
+          arr.push(`'${pt.operator}' operation is not available`)
+        }
+        this.validateAgainstMeta(pt.left, arr)
+        this.validateAgainstMeta(pt.right, arr)
+      }
+      return arr
     }
   }
 }
diff --git a/packages/nc-gui/components/project/spreadsheet/components/editVirtualColumn.vue b/packages/nc-gui/components/project/spreadsheet/components/editVirtualColumn.vue
index 173e86c301..2ed0db6d7a 100644
--- a/packages/nc-gui/components/project/spreadsheet/components/editVirtualColumn.vue
+++ b/packages/nc-gui/components/project/spreadsheet/components/editVirtualColumn.vue
@@ -34,6 +34,18 @@
               outlined
             />
           </v-col>
+
+          <v-col v-if="column.formula" cols="12">
+            <formula-options
+              ref="formula"
+              :value="column.formula"
+              :column="column"
+              :new-column="newColumn"
+              :nodes="nodes"
+              :meta="meta"
+              :alias="newColumn._cn"
+            />
+          </v-col>
         </v-row>
       </v-container>
     </v-form>
@@ -41,9 +53,11 @@
 </template>
 
 <script>
+import FormulaOptions from '@/components/project/spreadsheet/components/editColumn/formulaOptions'
+
 export default {
   name: 'EditVirtualColumn',
-  components: {},
+  components: { FormulaOptions },
   props: {
     nodes: Object,
     meta: Object,
@@ -71,21 +85,25 @@ export default {
     },
     async save() {
       try {
-        await this.$store.dispatch('sqlMgr/ActSqlOp', [{
-          env: this.nodes.env,
-          dbAlias: this.nodes.dbAlias
-        }, 'xcUpdateVirtualKeyAlias', {
-          tn: this.nodes.tn,
-          oldAlias: this.column._cn,
-          newAlias: this.newColumn._cn
-        }])
-
-        this.$toast.success('Successfully updated alias').goAway(3000)
+        if (this.column.formula) {
+          await this.$refs.formula.update()
+        } else {
+          await this.$store.dispatch('sqlMgr/ActSqlOp', [{
+            env: this.nodes.env,
+            dbAlias: this.nodes.dbAlias
+          }, 'xcUpdateVirtualKeyAlias', {
+            tn: this.nodes.tn,
+            oldAlias: this.column._cn,
+            newAlias: this.newColumn._cn
+          }])
+
+          this.$toast.success('Successfully updated alias').goAway(3000)
+        }
       } catch (e) {
         console.log(e)
         this.$toast.error('Failed to update column alias').goAway(3000)
       }
-      this.$emit('saved')
+      this.$emit('saved', this.newColumn._cn)
       this.$emit('input', false)
     },
 
diff --git a/packages/nc-gui/components/project/spreadsheet/components/fieldsMenu.vue b/packages/nc-gui/components/project/spreadsheet/components/fieldsMenu.vue
index 9613b97202..f7685589a7 100644
--- a/packages/nc-gui/components/project/spreadsheet/components/fieldsMenu.vue
+++ b/packages/nc-gui/components/project/spreadsheet/components/fieldsMenu.vue
@@ -50,7 +50,7 @@
           v-for="field in fieldsOrderLoc"
         >
           <v-list-item
-            v-if="field.toLowerCase().indexOf(fieldFilter.toLowerCase()) > -1"
+            v-if="field && field.toLowerCase().indexOf(fieldFilter.toLowerCase()) > -1"
             :key="field"
             dense
           >
diff --git a/packages/nc-gui/components/project/spreadsheet/components/virtualCell/formulaCell.vue b/packages/nc-gui/components/project/spreadsheet/components/virtualCell/formulaCell.vue
index 6efbac99ec..eb841a844d 100644
--- a/packages/nc-gui/components/project/spreadsheet/components/virtualCell/formulaCell.vue
+++ b/packages/nc-gui/components/project/spreadsheet/components/virtualCell/formulaCell.vue
@@ -1,5 +1,17 @@
 <template>
-  <div>{{ row[column._cn] }}</div>
+  <v-tooltip
+    v-if="column.formula && column.formula.error && column.formula.error.length"
+    bottom
+    color="error"
+  >
+    <template #activator="{on}">
+      <span class="caption" v-on="on">ERR<span class="error--text">!</span></span>
+    </template>
+    <span class=" font-weight-bold">{{ column.formula.error.join(', ') }}</span>
+  </v-tooltip>
+  <div v-else>
+    {{ row[column._cn] }}
+  </div>
 </template>
 
 <script>
diff --git a/packages/nc-gui/components/project/spreadsheet/components/virtualHeaderCell.vue b/packages/nc-gui/components/project/spreadsheet/components/virtualHeaderCell.vue
index 34970e8f82..66a096d7b9 100644
--- a/packages/nc-gui/components/project/spreadsheet/components/virtualHeaderCell.vue
+++ b/packages/nc-gui/components/project/spreadsheet/components/virtualHeaderCell.vue
@@ -196,6 +196,8 @@ export default {
         return `'${this.column.bt._tn}' belongs to '${this.column.bt._rtn}'`
       } else if (this.column.lk) {
         return `'${this.column.lk._lcn}' from '${this.column.lk._ltn}' (${this.column.lk.type})`
+      } else if (this.column.formula) {
+        return `Formula - ${this.column.formula.value}`
       }
       return ''
     }
@@ -249,9 +251,36 @@ export default {
         console.log(e)
       }
     },
+    async deleteFormulaColumn() {
+      try {
+        await this.$store.dispatch('meta/ActLoadMeta', {
+          dbAlias: this.nodes.dbAlias,
+          env: this.nodes.env,
+          tn: this.meta.tn,
+          force: true
+        })
+        const meta = JSON.parse(JSON.stringify(this.$store.state.meta.metas[this.meta.tn]))
+        // remove formula from virtual columns
+        meta.v = meta.v.filter(cl => !cl.formula || cl._cn !== this.column._cn)
+
+        await this.$store.dispatch('sqlMgr/ActSqlOp', [{
+          env: this.nodes.env,
+          dbAlias: this.nodes.dbAlias
+        }, 'xcModelSet', {
+          tn: this.nodes.tn,
+          meta
+        }])
+        this.$emit('saved')
+        this.columnDeleteDialog = false
+      } catch (e) {
+        console.log(e)
+      }
+    },
     async deleteColumn() {
       if (this.column.lk) {
         await this.deleteLookupColumn()
+      } else if (this.column.formula) {
+        await this.deleteFormulaColumn()
       } else {
         await this.deleteRelation()
       }
diff --git a/packages/nc-gui/package-lock.json b/packages/nc-gui/package-lock.json
index ac5f059529..5ea4b8f874 100644
--- a/packages/nc-gui/package-lock.json
+++ b/packages/nc-gui/package-lock.json
@@ -8437,6 +8437,11 @@
       "integrity": "sha1-peZUwuWi3rXyAdls77yoDA7y9RM=",
       "dev": true
     },
+    "jsep": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/jsep/-/jsep-0.4.0.tgz",
+      "integrity": "sha512-UDkrzhJK8hmgXeGK8WIiecc/cuW4Vnx5nnrRma7yaxK0WXlvZ4VerGrcxPzifd/CA6QdcI1hpXqr22tHKXpcQA=="
+    },
     "jsesc": {
       "version": "2.5.2",
       "resolved": "https://registry.npmjs.org/jsesc/-/jsesc-2.5.2.tgz",
diff --git a/packages/nc-gui/package.json b/packages/nc-gui/package.json
index 9434bdd74a..55658b6a01 100644
--- a/packages/nc-gui/package.json
+++ b/packages/nc-gui/package.json
@@ -25,6 +25,7 @@
     "file-saver": "^2.0.5",
     "fix-path": "^3.0.0",
     "inflection": "^1.12.0",
+    "jsep": "^0.4.0",
     "material-design-icons-iconfont": "^5.0.1",
     "monaco-editor": "^0.18.1",
     "monaco-themes": "^0.2.5",
diff --git a/packages/nocodb/src/__tests__/formula.test.ts b/packages/nocodb/src/__tests__/formula.test.ts
index 3f60128298..0752ef14e7 100644
--- a/packages/nocodb/src/__tests__/formula.test.ts
+++ b/packages/nocodb/src/__tests__/formula.test.ts
@@ -1,7 +1,7 @@
 import {expect} from 'chai';
 import 'mocha';
 import knex from '../lib/dataMapper/lib/sql/CustomKnex';
-import formulaQueryBuilder from "../lib/dataMapper/lib/sql/formulaQueryBuilder";
+import formulaQueryBuilderFromString from "../lib/dataMapper/lib/sql/formulaQueryBuilderFromString";
 
 process.env.TEST = 'test';
 
@@ -31,24 +31,24 @@ describe('{Auth, CRUD, HasMany, Belongs} Tests', () => {
   describe('Formulas', function () {
 
     it('Simple formula', function (done) {
-      expect(formulaQueryBuilder("concat(city, ' _ ',city_id+country_id)", 'a',knexMysqlRef).toQuery()).eq('concat(`city`,\' _ \',`city_id` + `country_id`) as a')
-      expect(formulaQueryBuilder("concat(city, ' _ ',city_id+country_id)", 'a',knexPgRef).toQuery()).eq('concat("city",\' _ \',"city_id" + "country_id") as a')
-      expect(formulaQueryBuilder("concat(city, ' _ ',city_id+country_id)", 'a',knexMssqlRef).toQuery()).eq('concat([city],\' _ \',[city_id] + [country_id]) as a')
-      expect(formulaQueryBuilder("concat(city, ' _ ',city_id+country_id)", 'a',knexSqliteRef).toQuery()).eq('`city` || \' _ \' || (`city_id` + `country_id`) as a')
+      expect(formulaQueryBuilderFromString("concat(city, ' _ ',city_id+country_id)", 'a',knexMysqlRef).toQuery()).eq('concat(`city`,\' _ \',`city_id` + `country_id`) as a')
+      expect(formulaQueryBuilderFromString("concat(city, ' _ ',city_id+country_id)", 'a',knexPgRef).toQuery()).eq('concat("city",\' _ \',"city_id" + "country_id") as a')
+      expect(formulaQueryBuilderFromString("concat(city, ' _ ',city_id+country_id)", 'a',knexMssqlRef).toQuery()).eq('concat([city],\' _ \',[city_id] + [country_id]) as a')
+      expect(formulaQueryBuilderFromString("concat(city, ' _ ',city_id+country_id)", 'a',knexSqliteRef).toQuery()).eq('`city` || \' _ \' || (`city_id` + `country_id`) as a')
         done()
     });
     it('Addition', function (done) {
-      expect(formulaQueryBuilder("ADD(city_id,country_id,2,3,4,5,4)", 'a',knexMysqlRef).toQuery()).eq('`city_id` + `country_id` + 2 + 3 + 4 + 5 + 4 as a')
-      expect(formulaQueryBuilder("ADD(city_id,country_id,2,3,4,5,4)", 'a',knexPgRef).toQuery()).eq('"city_id" + "country_id" + 2 + 3 + 4 + 5 + 4 as a')
-      expect(formulaQueryBuilder("ADD(city_id,country_id,2,3,4,5,4)", 'a',knexMssqlRef).toQuery()).eq('[city_id] + [country_id] + 2 + 3 + 4 + 5 + 4 as a')
-      expect(formulaQueryBuilder("ADD(city_id,country_id,2,3,4,5,4)", 'a',knexSqliteRef).toQuery()).eq('`city_id` + `country_id` + 2 + 3 + 4 + 5 + 4 as a')
+      expect(formulaQueryBuilderFromString("ADD(city_id,country_id,2,3,4,5,4)", 'a',knexMysqlRef).toQuery()).eq('`city_id` + `country_id` + 2 + 3 + 4 + 5 + 4 as a')
+      expect(formulaQueryBuilderFromString("ADD(city_id,country_id,2,3,4,5,4)", 'a',knexPgRef).toQuery()).eq('"city_id" + "country_id" + 2 + 3 + 4 + 5 + 4 as a')
+      expect(formulaQueryBuilderFromString("ADD(city_id,country_id,2,3,4,5,4)", 'a',knexMssqlRef).toQuery()).eq('[city_id] + [country_id] + 2 + 3 + 4 + 5 + 4 as a')
+      expect(formulaQueryBuilderFromString("ADD(city_id,country_id,2,3,4,5,4)", 'a',knexSqliteRef).toQuery()).eq('`city_id` + `country_id` + 2 + 3 + 4 + 5 + 4 as a')
       done()
     });
     it('Average', function (done) {
-      expect(formulaQueryBuilder("AVG(city_id,country_id,2,3,4,5,4)", 'a',knexMysqlRef).toQuery()).eq('(`city_id` + `country_id` + 2 + 3 + 4 + 5 + 4) / 7 as a')
-      expect(formulaQueryBuilder("AVG(city_id,country_id,2,3,4,5,4)", 'a',knexPgRef).toQuery()).eq('("city_id" + "country_id" + 2 + 3 + 4 + 5 + 4) / 7 as a')
-      expect(formulaQueryBuilder("AVG(city_id,country_id,2,3,4,5,4)", 'a',knexMssqlRef).toQuery()).eq('([city_id] + [country_id] + 2 + 3 + 4 + 5 + 4) / 7 as a')
-      expect(formulaQueryBuilder("AVG(city_id,country_id,2,3,4,5,4)", 'a',knexSqliteRef).toQuery()).eq('(`city_id` + `country_id` + 2 + 3 + 4 + 5 + 4) / 7 as a')
+      expect(formulaQueryBuilderFromString("AVG(city_id,country_id,2,3,4,5,4)", 'a',knexMysqlRef).toQuery()).eq('(`city_id` + `country_id` + 2 + 3 + 4 + 5 + 4) / 7 as a')
+      expect(formulaQueryBuilderFromString("AVG(city_id,country_id,2,3,4,5,4)", 'a',knexPgRef).toQuery()).eq('("city_id" + "country_id" + 2 + 3 + 4 + 5 + 4) / 7 as a')
+      expect(formulaQueryBuilderFromString("AVG(city_id,country_id,2,3,4,5,4)", 'a',knexMssqlRef).toQuery()).eq('([city_id] + [country_id] + 2 + 3 + 4 + 5 + 4) / 7 as a')
+      expect(formulaQueryBuilderFromString("AVG(city_id,country_id,2,3,4,5,4)", 'a',knexSqliteRef).toQuery()).eq('(`city_id` + `country_id` + 2 + 3 + 4 + 5 + 4) / 7 as a')
       done()
     });
   });
diff --git a/packages/nocodb/src/interface/XcDynamicChanges.ts b/packages/nocodb/src/interface/XcDynamicChanges.ts
index d0d19c626f..ae9c7cef5b 100644
--- a/packages/nocodb/src/interface/XcDynamicChanges.ts
+++ b/packages/nocodb/src/interface/XcDynamicChanges.ts
@@ -4,7 +4,7 @@ export default interface XcDynamicChanges {
   onTableDelete(tn: string): Promise<void>;
   onTableRename(oldTableName: string, newTableName: string): Promise<void>;
   onHandlerCodeUpdate(tn: string): Promise<void>;
-  onValidationUpdate(tn:string):Promise<void>;
+  onMetaUpdate(tn:string):Promise<void>;
 }
 
 
diff --git a/packages/nocodb/src/lib/dataMapper/lib/sql/BaseModelSql.ts b/packages/nocodb/src/lib/dataMapper/lib/sql/BaseModelSql.ts
index edcc0dd22c..fc1aaebd29 100644
--- a/packages/nocodb/src/lib/dataMapper/lib/sql/BaseModelSql.ts
+++ b/packages/nocodb/src/lib/dataMapper/lib/sql/BaseModelSql.ts
@@ -3,7 +3,7 @@ import _ from 'lodash';
 import Validator from 'validator';
 
 import BaseModel, {XcFilter, XcFilterWithAlias} from '../BaseModel';
-import formulaQueryBuilder from "./formulaQueryBuilder";
+import formulaQueryBuilder from "./formulaQueryBuilderFromString";
 
 
 /**
@@ -1863,8 +1863,8 @@ class BaseModelSql extends BaseModel {
 
   protected get selectFormulas() {
     return (this.virtualColumns || [])?.reduce((arr, v) => {
-      if (v.formula?.value) {
-        arr.push(formulaQueryBuilder(v.formula?.value, v._cn, this.dbDriver))
+      if (v.formula?.value && !v.formula?.error?.length) {
+        arr.push(formulaQueryBuilder(v.formula?.tree, v._cn, this.dbDriver))
       }
       return arr;
     }, [])
diff --git a/packages/nocodb/src/lib/dataMapper/lib/sql/formulaQueryBuilder.ts b/packages/nocodb/src/lib/dataMapper/lib/sql/formulaQueryBuilderFromString.ts
similarity index 91%
rename from packages/nocodb/src/lib/dataMapper/lib/sql/formulaQueryBuilder.ts
rename to packages/nocodb/src/lib/dataMapper/lib/sql/formulaQueryBuilderFromString.ts
index cf5404f7e6..1231d84f1e 100644
--- a/packages/nocodb/src/lib/dataMapper/lib/sql/formulaQueryBuilder.ts
+++ b/packages/nocodb/src/lib/dataMapper/lib/sql/formulaQueryBuilderFromString.ts
@@ -3,7 +3,14 @@ import jsep from 'jsep';
 
 // todo: switch function based on database
 
-export default function formulaQueryBuilder(str, alias, knex) {
+export function formulaQueryBuilderFromString(str, alias, knex) {
+  return formulaQueryBuilder(jsep(str), alias,knex)
+}
+
+
+
+
+export default function formulaQueryBuilder(tree, alias, knex) {
   const fn = (pt, a?, prevBinaryOp ?) => {
     const colAlias = a ? ` as ${a}` : '';
     if (pt.type === 'CallExpression') {
@@ -63,7 +70,7 @@ export default function formulaQueryBuilder(str, alias, knex) {
       return query;
     }
   };
-  return fn(jsep(str), alias)
+  return fn(tree, alias)
 }
 
 
diff --git a/packages/nocodb/src/lib/noco/NcProjectBuilder.ts b/packages/nocodb/src/lib/noco/NcProjectBuilder.ts
index aab9d94e6b..65333c49fb 100644
--- a/packages/nocodb/src/lib/noco/NcProjectBuilder.ts
+++ b/packages/nocodb/src/lib/noco/NcProjectBuilder.ts
@@ -229,7 +229,7 @@ export default class NcProjectBuilder {
         break;
 
       case 'xcModelSet':
-        await curBuilder.onValidationUpdate(data.req.args.tn);
+        await curBuilder.onMetaUpdate(data.req.args.tn);
         console.log(`Updated validations for table : ${data.req.args.tn}`)
         break;
       case 'xcUpdateVirtualKeyAlias':
diff --git a/packages/nocodb/src/lib/noco/common/BaseApiBuilder.ts b/packages/nocodb/src/lib/noco/common/BaseApiBuilder.ts
index 582b93c98a..365d49c3b1 100644
--- a/packages/nocodb/src/lib/noco/common/BaseApiBuilder.ts
+++ b/packages/nocodb/src/lib/noco/common/BaseApiBuilder.ts
@@ -24,6 +24,8 @@ import XcCache from "../plugins/adapters/cache/XcCache";
 import BaseModel from "./BaseModel";
 import {XcCron} from "./XcCron";
 import NcConnectionMgr from "./NcConnectionMgr";
+import updateColumnNameInFormula from "./helpers/updateColumnNameInFormula";
+import addErrorOnColumnDeleteInFormula from "./helpers/addErrorOnColumnDeleteInFormula";
 
 const log = debug('nc:api:base');
 
@@ -310,10 +312,12 @@ export default abstract class BaseApiBuilder<T extends Noco> implements XcDynami
     throw new Error('`onGqlSchemaUpdate` not implemented')
   }
 
-  public async onValidationUpdate(tn: string): Promise<void> {
+  // todo: change name to meta uodate
+  public async onMetaUpdate(tn: string): Promise<void> {
     this.baseLog(`onValidationUpdate : '%s'`, tn);
     const modelRow = await this.xcMeta.metaGet(this.projectId, this.dbAlias, 'nc_models', {
-      title: tn
+      title: tn,
+      type:'table'
     });
 
     if (!modelRow) {
@@ -325,6 +329,8 @@ export default abstract class BaseApiBuilder<T extends Noco> implements XcDynami
     this.baseLog(`onValidationUpdate : Generating model instance for '%s' table`, tn)
     this.models[modelRow.title] = this.getBaseModel(metaObj);
 
+    XcCache.del([this.projectId, this.dbAlias, 'table', tn].join('::'));
+
     // todo: check tableAlias changed or not
     // todo:
     // await this.onTableRename(tn, tn)
@@ -415,8 +421,15 @@ export default abstract class BaseApiBuilder<T extends Noco> implements XcDynami
           newCol.validate = oldCol.validate;
         }
 
+        // column rename
         if (column.cno !== column.cn) {
 
+          updateColumnNameInFormula({
+            virtualColumns: newMeta.v,
+            oldColumnName: oldCol.cn,
+            newColumnName: newCol.cn,
+          })
+
           // todo: populate alias
           newCol._cn = newCol.cn;
 
@@ -572,6 +585,11 @@ export default abstract class BaseApiBuilder<T extends Noco> implements XcDynami
           }
         }
 
+        addErrorOnColumnDeleteInFormula({
+          virtualColumns: newMeta.v,
+          columnName: column.cno
+        })
+
         aclOper.push(async () => this.deleteColumnNameInACL(tn, column.cno));
 
 
diff --git a/packages/nocodb/src/lib/noco/common/helpers/addErrorOnColumnDeleteInFormula.ts b/packages/nocodb/src/lib/noco/common/helpers/addErrorOnColumnDeleteInFormula.ts
new file mode 100644
index 0000000000..57cfdd91ed
--- /dev/null
+++ b/packages/nocodb/src/lib/noco/common/helpers/addErrorOnColumnDeleteInFormula.ts
@@ -0,0 +1,34 @@
+export default function (args: {
+  virtualColumns,
+  columnName: string
+}): void | boolean {
+
+  let modified = false;
+
+  const fn = (pt, virtualColumn) => {
+    if (pt.type === 'CallExpression') {
+      pt.arguments.map(arg => fn(arg, virtualColumn))
+    } else if (pt.type === 'Literal') {
+    } else if (pt.type === 'Identifier') {
+      if (pt.name === args.columnName) {
+        virtualColumn.formula.error = virtualColumn.formula.error || [];
+        virtualColumn.formula.error.push(`Column '${args.columnName}' was deleted`)
+        modified = true;
+      }
+    } else if (pt.type === 'BinaryExpression') {
+      fn(pt.left, virtualColumn);
+      fn(pt.right, virtualColumn);
+    }
+  };
+
+  if (!args.virtualColumns) {
+    return
+  }
+  for (const v of args.virtualColumns) {
+    if (!v.formula?.tree) {
+      continue;
+    }
+    fn(v.formula.tree, v)
+  }
+  return modified;
+}
\ No newline at end of file
diff --git a/packages/nocodb/src/lib/noco/common/helpers/jsepTreeToFormula.ts b/packages/nocodb/src/lib/noco/common/helpers/jsepTreeToFormula.ts
new file mode 100644
index 0000000000..75c9ce68dc
--- /dev/null
+++ b/packages/nocodb/src/lib/noco/common/helpers/jsepTreeToFormula.ts
@@ -0,0 +1,43 @@
+export default function jsepTreeToFormula(node) {
+  if (node.type === 'BinaryExpression' || node.type === 'LogicalExpression') {
+    return '(' + jsepTreeToFormula(node.left) + ' ' + node.operator + ' ' + jsepTreeToFormula(node.right) + ')'
+  }
+
+  if (node.type === 'UnaryExpression') {
+    return node.operator + jsepTreeToFormula(node.argument)
+  }
+
+  if (node.type === 'MemberExpression') {
+    return jsepTreeToFormula(node.object) + '[' + jsepTreeToFormula(node.property) + ']'
+  }
+
+  if (node.type === 'Identifier') {
+    return node.name
+  }
+
+  if (node.type === 'Literal') {
+    if (typeof node.value === 'string') {
+      return '"' + node.value + '"'
+    }
+
+    return '' + node.value
+  }
+
+  if (node.type === 'CallExpression') {
+    return jsepTreeToFormula(node.callee) + '(' + node.arguments.map(jsepTreeToFormula).join(', ') + ')'
+  }
+
+  if (node.type === 'ArrayExpression') {
+    return '[' + node.elements.map(jsepTreeToFormula).join(', ') + ']'
+  }
+
+  if (node.type === 'Compound') {
+    return node.body.map(e => jsepTreeToFormula(e)).join(' ')
+  }
+
+  if (node.type === 'ConditionalExpression') {
+    return jsepTreeToFormula(node.test) + ' ? ' + jsepTreeToFormula(node.consequent) + ' : ' + jsepTreeToFormula(node.alternate)
+  }
+
+  return ''
+}
\ No newline at end of file
diff --git a/packages/nocodb/src/lib/noco/common/helpers/updateColumnNameInFormula.ts b/packages/nocodb/src/lib/noco/common/helpers/updateColumnNameInFormula.ts
new file mode 100644
index 0000000000..53d42f5d24
--- /dev/null
+++ b/packages/nocodb/src/lib/noco/common/helpers/updateColumnNameInFormula.ts
@@ -0,0 +1,37 @@
+import jsepTreeToFormula from "./jsepTreeToFormula";
+
+export default function (args: {
+  virtualColumns,
+  oldColumnName: string,
+  newColumnName: string,
+}): void | boolean {
+
+  let modified = false;
+
+  const fn = (pt) => {
+    if (pt.type === 'CallExpression') {
+      pt.arguments.map(arg => fn(arg))
+    } else if (pt.type === 'Literal') {
+    } else if (pt.type === 'Identifier') {
+      if (pt.name === args.oldColumnName) {
+        pt.name = args.newColumnName;
+        modified = true;
+      }
+    } else if (pt.type === 'BinaryExpression') {
+      fn(pt.left);
+      fn(pt.right);
+    }
+  };
+
+  if (!args.virtualColumns) {
+    return
+  }
+  for (const v of args.virtualColumns) {
+    if (!v.formula?.tree) {
+      continue;
+    }
+    fn(v.formula.tree)
+    v.formula.value = jsepTreeToFormula(v.formula.tree)
+  }
+  return modified;
+}
\ No newline at end of file
diff --git a/packages/nocodb/src/lib/noco/rest/RestApiBuilder.ts b/packages/nocodb/src/lib/noco/rest/RestApiBuilder.ts
index 4c313fe08e..22fc2d128d 100644
--- a/packages/nocodb/src/lib/noco/rest/RestApiBuilder.ts
+++ b/packages/nocodb/src/lib/noco/rest/RestApiBuilder.ts
@@ -398,7 +398,13 @@ export class RestApiBuilder extends BaseApiBuilder<Noco> {
 
         this.log('xcTablesPopulate : Generating swagger apis for \'%s\' - %s', table.tn, table.type)
         /* create swagger json for table */
-        swaggerRefs[table.tn].push(await new SwaggerXc({dir: '', ctx, filename: ''}).getObject())
+        swaggerRefs[table.tn].push(await new SwaggerXc({
+          dir: '',
+          ctx: {
+            ...ctx,
+            v: meta.v
+          }, filename: ''
+        }).getObject())
 
         await this.generateAndSaveAcl(table.tn, table.type);
 
@@ -995,7 +1001,7 @@ export class RestApiBuilder extends BaseApiBuilder<Noco> {
   // NOTE: xc-meta
   public async onRelationCreate(tnp: string, tnc: string, args): Promise<void> {
     await super.onRelationCreate(tnp, tnc, args)
-    const newRelatedTableSwagger = [];
+    // const newRelatedTableSwagger = [];
     this.log('onRelationCreate : \'%s\' ==> \'%s\'', tnp, tnc)
 
     this.deleteRoutesForTables([tnp, tnc])
@@ -1004,6 +1010,7 @@ export class RestApiBuilder extends BaseApiBuilder<Noco> {
       const swaggerArr = [];
       const columns = this.metas[tnp]?.columns;
       const hasMany = this.extractHasManyRelationsOfTable(relations, tnp);
+      const belongsTo = this.extractBelongsToRelationsOfTable(relations, tnp);
 
       // set table name alias
       hasMany.forEach(r => {
@@ -1011,10 +1018,9 @@ export class RestApiBuilder extends BaseApiBuilder<Noco> {
         r._tn = this.getTableNameAlias(r.tn);
       })
 
-      const ctx = this.generateContextForTable(tnp, columns, relations, hasMany, []);
+      const ctx = this.generateContextForTable(tnp, columns, relations, hasMany, belongsTo);
       const meta = ModelXcMetaFactory.create(this.connectionConfig, {dir: '', ctx, filename: ''}).getObject();
 
-      newRelatedTableSwagger.push(new SwaggerXc({ctx}).getObject());
 
       // update old model meta with new details
       const existingModel = await this.xcMeta.metaGet(this.projectId, this.dbAlias, 'nc_models', {'title': tnp});
@@ -1025,7 +1031,7 @@ export class RestApiBuilder extends BaseApiBuilder<Noco> {
       }
 
 
-      swaggerArr.push(JSON.parse(existingModel.schema));
+      // swaggerArr.push(JSON.parse(existingModel.schema));
       if (existingModel) {
         this.log(`onRelationCreate : Updating model metadata for parent table '%s'`, tnp);
         // todo: persisting old table_alias and columnAlias
@@ -1046,6 +1052,8 @@ export class RestApiBuilder extends BaseApiBuilder<Noco> {
           _cn: `${this.getTableNameAlias(tnp)} => ${this.getTableNameAlias(tnc)}`
         })
 
+        swaggerArr.push(new SwaggerXc({ctx:{...ctx, v: oldMeta.v}}).getObject());
+
 
         if (queryParams?.showFields) {
           queryParams.showFields[`${this.getTableNameAlias(tnp)} => ${this.getTableNameAlias(tnc)}`] = true;
@@ -1100,7 +1108,8 @@ export class RestApiBuilder extends BaseApiBuilder<Noco> {
       const swaggerArr = [];
       const columns = this.metas[tnc]?.columns;
       const belongsTo = this.extractBelongsToRelationsOfTable(relations, tnc);
-      const ctx = this.generateContextForTable(tnc, columns, relations, [], belongsTo);
+      const hasMany = this.extractHasManyRelationsOfTable(relations, tnc);
+      const ctx = this.generateContextForTable(tnc, columns, relations, hasMany, belongsTo);
       const meta = ModelXcMetaFactory.create(this.connectionConfig, this.generateRendererArgs(ctx)).getObject();
 
 
@@ -1121,7 +1130,7 @@ export class RestApiBuilder extends BaseApiBuilder<Noco> {
       }
 
 
-      swaggerArr.push(JSON.parse(existingModel.schema))
+      // swaggerArr.push(JSON.parse(existingModel.schema))
       if (existingModel) {
         meta.belongsTo.forEach(hm => {
           hm.enabled = true;
@@ -1140,6 +1149,9 @@ export class RestApiBuilder extends BaseApiBuilder<Noco> {
           _cn: `${this.getTableNameAlias(tnp)} <= ${this.getTableNameAlias(tnc)}`
         })
 
+        swaggerArr.push(new SwaggerXc({ctx:{...ctx, v: oldMeta.v}}).getObject());
+
+
 
         if (queryParams?.showFields) {
           queryParams.showFields[`${this.getTableNameAlias(tnp)} <= ${this.getTableNameAlias(tnc)}`] = true;
@@ -1744,6 +1756,48 @@ export class RestApiBuilder extends BaseApiBuilder<Noco> {
     // add new routes
 
   }
+
+  public async onMetaUpdate(tn: string) {
+    await super.onMetaUpdate(tn);
+    const ctx = this.generateContextForTable(
+      tn,
+      this.metas[tn].columns,
+      [...this.metas[tn].belongsTo, ...this.metas[tn].hasMany],
+      this.metas[tn].hasMany,
+      this.metas[tn].belongsTo
+    );
+
+    const swaggerDoc = await new SwaggerXc({
+      dir: '', ctx: {
+        ...ctx,
+        v: this.metas[tn].v
+      }, filename: ''
+    }).getObject();
+    const meta = await this.xcMeta.metaGet(this.projectId, this.dbAlias, 'nc_models', {
+      title: tn,
+      type: 'table'
+    });
+    const oldSwaggerDoc = JSON.parse(meta.schema);
+
+    // keep upto 5 schema backup on table update
+    let previousSchemas = [oldSwaggerDoc]
+    if (meta.schema_previous) {
+      previousSchemas = [...JSON.parse(meta.schema_previous), oldSwaggerDoc].slice(-5);
+    }
+
+
+    oldSwaggerDoc.definitions = swaggerDoc.definitions;
+    await this.xcMeta.metaUpdate(this.projectId, this.dbAlias, 'nc_models', {
+      schema: JSON.stringify(oldSwaggerDoc),
+      schema_previous: JSON.stringify(previousSchemas)
+    }, {
+      title: tn,
+      type: 'table'
+    });
+
+    await this.onSwaggerDocUpdate(tn);
+  }
+
 }
 
 
diff --git a/packages/nocodb/src/lib/sqlMgr/code/routers/xc-ts/SwaggerXc.ts b/packages/nocodb/src/lib/sqlMgr/code/routers/xc-ts/SwaggerXc.ts
index 4075aba31a..b80c3c833f 100644
--- a/packages/nocodb/src/lib/sqlMgr/code/routers/xc-ts/SwaggerXc.ts
+++ b/packages/nocodb/src/lib/sqlMgr/code/routers/xc-ts/SwaggerXc.ts
@@ -84,6 +84,34 @@ class SwaggerXc extends BaseRender {
 
       properties[column._cn] = field;
     }
+
+    for (const column of (args.v || [])) {
+      const field: any = {};
+      field.readOnly = true;
+      let _cn = column._cn;
+
+      if (column.mm) {
+        field.type = 'array';
+        field.items = {
+          $ref: `#/definitions/${column.mm?._rtn}`
+        };
+        _cn = `${column.mm?._rtn}MMList`;
+      } else if (column.hm) {
+        field.type = 'array';
+        field.items = {
+          $ref: `#/definitions/${column.mm?._rtn}`
+        };
+        field.$ref = `#/definitions/${column.mm?._rtn}`
+        _cn = `${column.mm?._rtn}List`;
+      } else if (column.bt) {
+        field.$ref = `#/definitions/${column.mm?._tn}`
+        _cn = `${column.mm?._rtn}Read`;
+      }
+
+      properties[_cn] = field;
+
+    }
+
     return obj;
   }
 
@@ -190,7 +218,8 @@ class SwaggerXc extends BaseRender {
               {
                 "in": "query",
                 "name": "sort",
-                "description": "Comma separated sort fields",
+                "description":
+                  "Comma separated sort fields",
                 "type": "string"
               }